He and his son and daughter-in-law, Johan and Christine Erngren, are seen in the Salt Lake 17th Ward at the time of their rebaptisms on 3 May 1866, which was prior to that year's emigration season. His son's family are documented crossing the plains in 1865. It is uncertain if Lars traveled with them or if he was waiting for them in the Valley. Further research is needed to narrow the year of his travel and identify the company with which he traveled.
His birth date was recorded in the 17th Ward records at the time of his rebaptism.